TM 1-1520-240-105-9-1/(5-9-2 blank)SECTION IX. ADDITIONAL LIMITATIONS5-9-1. Air-to-Ground Towing.Air-to-ground towing operations are prohibited.5-9-2. APU Operation.APU operation in flight is prohibited except during emer-gencies.5-9-3. Pitot Tube and AFCS Sideslip Port Anti-IcingLimitation.The PITOT switch shall not be on for more than 5minuteson the ground.5-9-4. Windshield Heat.Windshield heat shall not be used above 24_C.5-9-5. Single Point Refueling.The maximum rate for pressure refueling is 300 gal/minat 55 psi.5-9-6. Extended Range Fuel System (ERFS).WARNINGInstalling the non-crashworthy/non selfsealing ERFS increases the potential forexplosion and burn injuries during acrash. Therefore, the number of personnelon board the helicopter should be kept tothe minimum required to perform the re-quired mission.ERFS operation will be in accordance with existing AirWorthiness Release (AWR).5-9-7. Extended Range Fuel System II (ERFS II)The following paragraphs contain important operatinglimits and restrictions that shall be observed during theoperation of the ERFS II. Compliance with these limitswill allow the operator to safely perform the assignedmissions and derive the maximum utility from the ERFSII.a.The maximum capacity of one ERFS II tank as-sembly is 825.5 US Gallons. The usable fuel in oneERFS II tank assembly is 800 US Gallons when singlepoint pressure refueled.CAUTIONTrying to pressure refuel the tanks withoutconnecting the vent lines could overpres-surize the tanks. b.The maximum pressure inside the ERFS II tankshould not exceed 5 PSI.CAUTIONConducting suction defueling at pres-sures greater than minus 11 PSI coulddamage the internal components of theERFS II tank assembly.c.The maximum allowable suction defueling pres-sure is minus 11 PSI.
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